Compression-pump.



F. G. PEREZ. GOMPREssIoN PUMP. APPLIOATION FILED FEB. 27, 1908. 921, 155, Patented May 11, 1909.

fw-JQ WITNESSES UNITED srArEs f FRANK G. PEREZ, OF SAN FRANCISCO, CALIFORNIA.` Y

coMPREssIoN-PUMP.

Speccationof Letters` Patent.

Patented May 11, 1909.

Applicatonled February 27, 1908. Serial No. 418,104.

To all whom 'it may concern:

Be it known that I, FRANK G. PEREZ, citi zen of the United States, residing at the city and county of San Francisco and State of California ,have invented new and useful'lmprovenients in Compression-Pumps, of which the following is a specification.

My invention relates to improvements in compression pumps such as are used for comp-f pressing gases, air, or other elastic fluids.

It consists in the combination of parts, and details of construction, which will be more fully explained by reference to the accompanying drawings, in which the figure represented is a vertical longitudinal section of the compression pump.

It is the object of my invention to provide an economically constructed and easily accessible apparatus which is useful forl the compression of ammonia gas, or other elastic p fluids. y

In the construction of my apparatus, I make a cylinder A of cold rolled steel, and afterward Ahbore and finish the interior. This interior is here shown in two sizes, in one portion of which the piston 2 is litted to reciprocate; and the other portion, contiguous to the head, is of larger diameter and has its inner face formed with a seat to receive the outlet or discharge valve 3, which is hcre shown as a beveled valve having a diameter equal to that ofthe bore of the cylinder A.

The piston 2 is formed with an extension 4, which is threaded upon the outside, and the piston-rod 5 has a cup-shaped enlargement 6 threaded upon the outside to t the correspondingthreads of the extension 4, so that when the parts are assembled it is only necessary to screw the piston-rod to this piston extension, and when it is. to be removed, it is done with equal facility. This extension 4 of the piston is counter-bored, as shown, and the opposite head of the piston is also counter-bored, there being a web 7 left between these two counter-bores.

The head of the piston has a beveled seat upon which `fits the corresponding bevel edge of the inlet valve 8. 0 This valve has a stem 9 extending into the counter-bore or chamber 10 upon the extension side of the piston, and the stem is guided through a hole made in the web 7, thus insuring the opening and closing of the valve with accuracy. The inner end of the valve stem has a nut or head 11 ixed to it, and between this and the web 7 is iitted a spiral spring 12, which serves to normally close the inletvvalve 8.

From the chamber or counter-bore, contiguous to the valve 8,holes 13 are bored diverging outwardly so that they open into the opposite end of the cylinder A exterior to the cap 6A of the .piston head; and when the piston is moved toward that end of the cylinder, the vacuum produced between the piston and the outlet valve 3 will open the valve 8, and air or vapor will be drawn through the holes 13 into the space on the opposite side of the piston. The return movement of the piston allows the valve 8 to close, and the compression of the gas between the piston and the outlet valve 3 will open this valve.

The inlet to the cylinder may be made as shown at 14, and the discharge may be at 15.

The piston-rod passes through the usual or any suitable stuffing-box, as at 16, and its outer end is screw-threaded, or otherwise fitted into a cross-head 17, which is slidable in guides, as at 18, to maintain the piston travel in a line axial with the cylinder. An suitable power connection may be made wit this cross-head and piston-rod, such as a connecting rod 19, from a crank or other impelling device.

The piston-rod 5 being screw-threaded into the cross-head 17, is readily adjustable in length, so that the head of the piston will move closely to the discharge valve 3 and insure the delivery of all the contents of the cylinder when this valve is opened. y

A lock-nut or other equivalent, as at 20, secures the piston-rod at any desired adjustment with relation to the cross-head.

The head 21 of the cylinder may be cast of iron, or otherwise formed, and is screwthreaded so as to engage with correspondin threads in the outer end of the cylinder, an it is thus easily fitted or removed. A suitable polygonal projection 22 serves for the application of a wrench for this purpose. The inner face of this head is extended, as shown at 23, and this extension serves as a guide for the spiral s ring 24 which encircles the extension an a similar short one upon the valve 3 against which the spring presses to insure the closure of the valve; and these projections maintain the spring in its proper relation.

The valve has a stem 3a, and the head 21 and extension 23 have a hole bored into them, into which the stem 3a extends, and 110 this hole forms a guide to insure the exact movement of the valve in its opening and closing. The chamber within which the stem 3a reciprccates, contains a small portion of air, and this forms a cushion to limit the rise el the valve, in case the spring is net suihcient.

All the parts el the device, such as the valves, piston, etc., may preferably be made of steel, which is not readily attacked by caustic vapors.

l have here shown a water-jacket 25 which is iitted to inclese the upper part oi the cylinder where the compression takes place. This jacket may be open at the top, and by means of any suitable source of supply Water is admitted, and may be allowed to discharge through a pipe, as at 26.

By the construction here shown, I am enabled to produce small gas compression cylinders at so small an expense that they may be installed 1n any place where it is desired to produce a cooling er reirigerating eilect,

, without building large and expensive apparatus. All parts of this engine are readily made, with a minimum of expense, and are easily disniounted or assembled, and will wear indefinitely.

Having thus described my invention, what l claim and desire to secure by Letters Patent is# l. ln an apparatus of the character described, the combination et a cylinder having an upwardly opening valve at one end, said valve having a centrally located stem, and said end oi the cylinder being counterbored and having a valve seat formed directly in the cylinder at the base of said counterbored portion, a head threaded into engagement with the outer end of the counterbored portion of the cylinder and closing this end of the cylinder, and having a guide for the central stem ci the valve, a piston reciproeable in the cylinder, said piston having an extension upon one side, a piston rod having a cup-shaped enlargement screwthreaded to fit the piston extension, said piston having a centrally formed counterbore or chamber in the side contiguous to the piston rod connection, a valve closahle upon a seat formed in the piston, having a stem slidable and guidablc in a web of said piston, and a spring surrounding the pistonvalve stem and serving to close the valve, said piston having diagonal bored passages extending from the space beneath the valve upwardly and downwardly and opening into the cylinder exterior to the piston-rod eennection.

2. ln an apparatus et the character described, the combination of a cylinder having a ceunterbore extending inwardly frein its outer end and having a valve seat at the base of said counterbore, a valve engaging said seat and having a centrally located stem, a head closing upon the outer end of the cylinder and having a threaded portion screwing inte engagement with the outer end of said eounterbore, a piston having a reduced threaded extension upon one side and having an interior web with a counter'- bore at each side thereof, said piston having a valve seat and having diagonally arranged passages leading from one of said reunierbores downwardly through the piston and into the cylinder below the stem, a valve closing upon the seat in the piston and having a stem extending through and guided upon said web and entering one el' said counter-bores, a spring surroninlinge; the valve stein, and a piston rod having a cupshaped enlargement provided with internal threads adapted to screw into engagement with the extension et the piston.

in testimony whereof l have hereunto sel my hand in presence of two subscribing witnesses.

FRANK G. PEREZ. litnesses:

Crninrns A. PENFinLn, S. H. Nonnen. 

